Bronze powder



UNITED STATES m BAEB, or NEW ronx, N. Y.

BRONZE POWDER.

Specification of Letters Patent.

Patented July 27, 1920.

No Drawing. Original application filed January 20, 1919, Serial No. 271 974. 'Divided and this application filed Febrnary 9, 1920.

To all whom it may concern Be it known that I, MAX BAER, a citizen of the United States, and resident of the borough of Manhattan, in the city, county, and State of New York, have invented certain new and useful Improvements in.

Bronze Powders, of which the following is a specification.

- This invention relates to bronze powders and the present is a divisional application of my application, Serial Number 271,974, filed January 20, 1919, and allowed December 30, 1919. It has for its object to provide a bronze powder which is bulkier and of larger body resulting in a correspondingly larger covering or spreading capacity than the bronze powders heretofore used. As a result of a larger spreading surface the cost of use is correspondingly decreased At the same time, my improved powder, when used, and particularly when used in the printing art, gives a finer and more superior polish.

The bronze powder anda process for mak-- ing it will be -hereinafter fully described,

and .the powder will be finally claimed in. the claims appended hereto. In the carrying out of the process, the fluid metal used for the bronze to be hammered, is cooled or chilled in the presence of water jets which strike against the bronze while it is in a fluid or molten state, and by the cooling or chilling resulting, the solidified bronze metal is porous and in the form of metal strips and pieces. The relative porosity of the granulated bronze, when subjected tothe hammer for breakingit up to powder form-causes the metal to break up quicker and into thinner and lighter pieces, than when ordinary cast bronze metal is used. Such breaking up, and the formation of such pieces, produces a bulkier and fluflier and. lighter powdered metal. I v v a During the time, that the bronze metal granulated as heretofore described in the -.i presence of water is subjected to the ham mering action of the hammers, it is treated .with a high grade olive oil or similar oil,'

which keeps the metal, while being crushed and powdered,more evenly distributed and oiled, the liquidity of theoilgiving a thin and light fat or oil'covering, which ouickly surrounds the particles as they 1 ecome broken by the hammers. This oil cc vering serves to keep apart the particles in that the use.

Serial No. 357,340.

oil covering serves to keep separate the adjacent particles and keep them from closely contacting. I I

After the metal as described has been hammered to the desired degree of fineness, to form bronze powder, the separate particles are what may be called fluffy, and as a result of this the superimposed particles serve to make a relatively large quantity compared to bronze powders heretofore in This flufliness gives a large spreading surface to the powder when it is applied to practical use, as the separate particles not being as compactly held together as powders heretofore in use, a given quantity of my improved powder may be spread further andfthereby, cover a largerarea, than the same quantity of powder heretofore known to the art. Moreover, and this is important, such fiufiiness of the finished product, brings about a better and more brilliant polish than powders heretofore in use, when such improved powders-are used in the printing arts. As an example, in the mak-..

or the separate particles being superim-.

posed, onlya stamping is required, and the additional polishing heretofore required is obviated since this single stamping of the flufly powder at the same time pollshes the powder on the cigar bands, so that a further or additional polishing is not necessary.

This is believed to be due to the fluify character of the particles, which create a certain resistance tothe stamping, whereby a polishing results, whereas with a highly powered powder, no such'resistanc'e is encountered, and thus an additional polish becomes necessary. At the same time, with the fluify powder described, the fluify -or flocc ulent form of the superimposed particles, spread to a greater extent, and form so to say several superimposed layers on the cigar band. The effect of this is that the lowermost layer, which becomes interposed between the paper and the uppermost layer of the powder, acts as a barrier to the action of any chemicals inherent in the paper. Thus in thepowders used heretofore the action ofthe chemicals of the paper would readily work right through the applied layer of powder, and thereby destroy the appearance of the gilt stamping'on the cigar bands. But in the use of the flocculent powder, in accordance with my invention, the strata that are formed by the flakes of metal, serve to insure a long life to the quality and brilliancy of the applied metal I powder.

In certain cases, it may be desirous of polishing the powder described, and in that case, my invention contemplates the forcing of the powdered metal against the sides of polishing drums with great speed or velocity, and without bristle orhair brushes or the use of lard as heretofore proposed. In certain cases, we find it advantageous to use steel or metal wire brushes, in connection with this polishing. If polishing is carried out, it 'will'be done totally different than heretofore, namely, without greasy,

fatty, or oily substances of any kind, and v absolutely d y.

I have spoken of a bronze powder, but

it is clear that other metal powders of shades such as gold, lemon, orange, fire, green, and copper may be used in place of the bronze powder.

I have described a process for the production of thenew'powder, but it is clear that changes may be scribed and in certain characteristics of the made in the steps depowder without separating from the spirit of my invention as defined in the appended claims. p

I claim as new and desire to secure by Letters Patent:

,1. A bronze powder unpolished and of fluffy and flocculent character granulated in the presence of water.

2. A bronze pow'der, made of metal granulated in the presence of water, hammered, and unpolished.

3. A bronze powder, made of porous solidified metal, hammered to powdered state, the powder being unpolished and of flufly and flocculent character.

4. A bronze powder made of metal granulated in a porous solidified state in the presence of water, hammered and unpolished.

5. A bron'ze powder, made of metal granulated in the presence of water and hammered in the presence of an oleaginous coverin the hammered particles being surrounded by said coveringand unpolished.

6. A bronz'e powder made of metal granulated in the presence of water, and hammered to powdered form.

In testimony that I claim the foregoing as my invention, I have signed my name hereunder.

'- 4 MAX BAER. 

